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VBScript-to-JavaScript Functions （转） |
FormatNumber(Expression, NumDigitsAfterDecimal, IncludeLeadingDigit,
UseParensForNegativeNumbers, GroupDigits)
======================================================================
function FormatNumber(num,decimalNum,bolLeadingZero,bolParens,bolCommas)
/**********************************************************************
IN:
NUM - the number to format
decimalNum - the number of decimal places to format the number to
bolLeadingZero - true / false - display a leading zero for
numbers between -1 and 1
bolParens - true / false - use parenthesis around negative numbers
bolCommas - put commas as number separators.
RETVAL:
The formatted number!
**********************************************************************/
{
if (isNaN(parseInt(num))) return "NaN";
var tmpNum = num;
var iSign = num < 0 ? -1 : 1; // Get sign of number
// Adjust number so only the specified number of numbers after
// the decimal point are shown.
tmpNum *= Math.pow(10,decimalNum);
tmpNum = Math.round(Math.abs(tmpNum))
tmpNum /= Math.pow(10,decimalNum);
tmpNum *= iSign; // Readjust for sign
// Create a string object to do our formatting on
var tmpNumStr = new String(tmpNum);
// See if we need to strip out the leading zero or not.
if (!bolLeadingZero && num < 1 && num > -1 && num != 0)
if (num > 0)
tmpNumStr = tmpNumStr.substring(1,tmpNumStr.length);
else
tmpNumStr = "-" + tmpNumStr.substring(2,tmpNumStr.length);
// See if we need to put in the commas
if (bolCommas && (num >= 1000 || num <= -1000)) {
var iStart = tmpNumStr.indexOf(".");
if (iStart < 0)
iStart = tmpNumStr.length;
iStart -= 3;
while (iStart >= 1) {
tmpNumStr = tmpNumStr.substring(0,iStart) + "," + tmpNumStr.substring(iStart,tmpNumStr.length)
iStart -= 3;
}
}< |
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